Astyanax hastatus Myers, 1928 (Teleostei, Characidae): a new species complex within the genus Astyanax?

Astyanax hastatus Myers, 1928 (Teleostei, Characidae): a new species complex within the genus Astyanax?

Four populations of Astyanax hastatus Myers 1928 from the Guapimirim River basin (Rio de Janeiro State) were analyzed and three distinct cytotypes identified. These cytotypes presented 2n = 50 chromosomes, with 4M+8SM+10ST+28A (Cytotype A), 8M+10SM+14ST+18A (Cytotype B), 6M+8SM+4ST+32A (Cytotype C) and scanty heterochromatin, mainly located throughout pericentromeric regions of several chromosomal pairs. No homologies with the As-51 satellite DNA were observed in the three cytotypes, although all of them presented multiple 18S rDNA sites, as detected by both silver nitrate staining and FISH (fluorescent in situ hybridization). The application of the term "species complex" in Astyanax is discussed from a cytotaxonomic viewpoint.

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Main Authors: Kavalco,Karine Frehner, Brandão,Karina de Oliveira, Pazza,Rubens, Almeida-Toledo,Lurdes Foresti de
Format: Digital revista
Language:English
Published: Sociedade Brasileira de Genética 2009
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300009
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spelling oai:scielo:S1415-475720090003000092009-08-10Astyanax hastatus Myers, 1928 (Teleostei, Characidae): a new species complex within the genus Astyanax?Kavalco,Karine FrehnerBrandão,Karina de OliveiraPazza,RubensAlmeida-Toledo,Lurdes Foresti de Astyanax hastatus molecular cytogenetics karyotypic evolution species complex Four populations of Astyanax hastatus Myers 1928 from the Guapimirim River basin (Rio de Janeiro State) were analyzed and three distinct cytotypes identified. These cytotypes presented 2n = 50 chromosomes, with 4M+8SM+10ST+28A (Cytotype A), 8M+10SM+14ST+18A (Cytotype B), 6M+8SM+4ST+32A (Cytotype C) and scanty heterochromatin, mainly located throughout pericentromeric regions of several chromosomal pairs. No homologies with the As-51 satellite DNA were observed in the three cytotypes, although all of them presented multiple 18S rDNA sites, as detected by both silver nitrate staining and FISH (fluorescent in situ hybridization). The application of the term "species complex" in Astyanax is discussed from a cytotaxonomic viewpoint.info:eu-repo/semantics/openAccessSociedade Brasileira de GenéticaGenetics and Molecular Biology v.32 n.3 20092009-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300009en10.1590/S1415-47572009005000055
institution SCIELO
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language English
format Digital
author Kavalco,Karine Frehner
Brandão,Karina de Oliveira
Pazza,Rubens
Almeida-Toledo,Lurdes Foresti de
spellingShingle Kavalco,Karine Frehner
Brandão,Karina de Oliveira
Pazza,Rubens
Almeida-Toledo,Lurdes Foresti de
Astyanax hastatus Myers, 1928 (Teleostei, Characidae): a new species complex within the genus Astyanax?
author_facet Kavalco,Karine Frehner
Brandão,Karina de Oliveira
Pazza,Rubens
Almeida-Toledo,Lurdes Foresti de
author_sort Kavalco,Karine Frehner
title Astyanax hastatus Myers, 1928 (Teleostei, Characidae): a new species complex within the genus Astyanax?
title_short Astyanax hastatus Myers, 1928 (Teleostei, Characidae): a new species complex within the genus Astyanax?
title_full Astyanax hastatus Myers, 1928 (Teleostei, Characidae): a new species complex within the genus Astyanax?
title_fullStr Astyanax hastatus Myers, 1928 (Teleostei, Characidae): a new species complex within the genus Astyanax?
title_full_unstemmed Astyanax hastatus Myers, 1928 (Teleostei, Characidae): a new species complex within the genus Astyanax?
title_sort astyanax hastatus myers, 1928 (teleostei, characidae): a new species complex within the genus astyanax?
description Four populations of Astyanax hastatus Myers 1928 from the Guapimirim River basin (Rio de Janeiro State) were analyzed and three distinct cytotypes identified. These cytotypes presented 2n = 50 chromosomes, with 4M+8SM+10ST+28A (Cytotype A), 8M+10SM+14ST+18A (Cytotype B), 6M+8SM+4ST+32A (Cytotype C) and scanty heterochromatin, mainly located throughout pericentromeric regions of several chromosomal pairs. No homologies with the As-51 satellite DNA were observed in the three cytotypes, although all of them presented multiple 18S rDNA sites, as detected by both silver nitrate staining and FISH (fluorescent in situ hybridization). The application of the term "species complex" in Astyanax is discussed from a cytotaxonomic viewpoint.
publisher Sociedade Brasileira de Genética
publishDate 2009
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300009
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